31210768139 has 2 divisors, whose sum is σ = 31210768140. Its totient is φ = 31210768138.

The previous prime is 31210768103. The next prime is 31210768153. The reversal of 31210768139 is 93186701213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31210768139 is a prime.

It is a super-2 number, since 2×31210768139² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31210768096 and 31210768105.

It is not a weakly prime, because it can be changed into another prime (31210768439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605384069 + 15605384070.

It is an arithmetic number, because the mean of its divisors is an integer number (15605384070).

Almost surely, 2^31210768139 is an apocalyptic number.

31210768139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210768139 is an equidigital number, since it uses as much as digits as its factorization.

31210768139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 31210768139 in words is "thirty-one billion, two hundred ten million, seven hundred sixty-eight thousand, one hundred thirty-nine".